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Thread: Smaller Upper Radiator Hose Leak

  1. #1
    Crestwood1001 Guest

    Smaller Upper Radiator Hose Leak

    Last Thursday I replaced my expansion tank, the upper rad hose had been replaced approximately 2 months ago. After the tank replacement everything was good, no leaks of any kind. Two days later I turned the car on and turned the AC on, stepped out to double check no leaks, and found it "spit" some coolant. I turned off the car and began to try and find the leak, was able to pin point it to the smaller of the two connections from the upper rad hose to the ET. Today I removed the upper radiator hose and cleaned the connections and replaced, no luck it still slowly drips.
    Does anyway have any ideas on how to seal this us? Its not a massive leak, its a slow stream and its not constant, it has not even leaked enough to require me to top off the coolant at this point. So far I see my options as try to get ECS to replace the tank, and order another new upper rad hose and start over. Only issue is this weekend are my only days off until next Sunday, so im going to have to monitor the fluid level and live with it until next weekend unless I can figure it out and get it fixed soon..... any help or tips are much appreciated!

  2. #2
    Crestwood1001 Guest
    Here's a quick pic of where it's leaking from...

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  3. #3
    Join Date
    Jan 1970
    Location
    Lebanon, OH
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    37,848
    Disassemble and look at o-ring. If it's good, there could be a defect in the mating surface on the tank.

    HTC DNA ON TT4 BETA, WILLIAMSBURG, VA
    "Flame suit NOT REQUIRED!!!"
    Call Me Dane l 2/2004 330i ZHP l 18x8 ET45 BBS CK's wrapped with Michelin Pilot Sport AS3+ @ 245-40-18 l KW V1 Coilovers in front l KW V1 springs w/ Bilstein B8 dampeners in rear l BMW Performance Rotors l UUC StrutBarbarian l Racing Dynamics Rear Strut Bar l Jim Conforti Shark Injector l Light Birch Interior Trim l Bimmian Celly Mount l M3 Trunk Mat l l e90 Performance E-Brake & Shift Knob l M3 Tri-Stitched Boots l AL Headlight Retrofit with ZKW Lenses l CobyWheel Wrap w/M3 Stitching l LCM sw 4.5 triple blink and rear fogs

  4. #4
    Crestwood1001 Guest
    I actually did not notice an o-ring in there, its very possible that it was still mated to the old tank which is now gone, is there a part number for a replacement o-ring or do you now of someone a similar size that I can find at a parts store? Was the ring inside the rad hose?

  5. #5
    Join Date
    Jan 1970
    Location
    Lebanon, OH
    Posts
    37,848
    I believe there is a piece of software on that joint.

    HTC DNA ON TT4 BETA, WILLIAMSBURG, VA
    "Flame suit NOT REQUIRED!!!"
    Call Me Dane l 2/2004 330i ZHP l 18x8 ET45 BBS CK's wrapped with Michelin Pilot Sport AS3+ @ 245-40-18 l KW V1 Coilovers in front l KW V1 springs w/ Bilstein B8 dampeners in rear l BMW Performance Rotors l UUC StrutBarbarian l Racing Dynamics Rear Strut Bar l Jim Conforti Shark Injector l Light Birch Interior Trim l Bimmian Celly Mount l M3 Trunk Mat l l e90 Performance E-Brake & Shift Knob l M3 Tri-Stitched Boots l AL Headlight Retrofit with ZKW Lenses l CobyWheel Wrap w/M3 Stitching l LCM sw 4.5 triple blink and rear fogs

  6. #6
    Crestwood1001 Guest
    I will disassemble again and check it out, if it comes down to it I will just order a new rad hose, I can eat the 30$ not a huge deal. Thanks for the help Dane.

  7. #7
    Join Date
    Aug 2011
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    Las Vegas, NV
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    5,701
    If you want I can measure the oring that's in my original upper radiator hose. You can even have it if needed.

    What brand Exspansion Tank did you get from ECS?
    I replied to your PM also.


    Gary
    BAVSOUND Stage 1 - UltraGauge - Valentine One - Orion V4's - ARC-8's
    TTFS Engine/SMG Tune/CSL 255 - SGT Headers/Sect 1/SCZA - Evolve Eventuri
    VIS XTS CF Hood - CF Lip/Console/Diffuser - OE CSL Trunk - BWS 500S 9k/11k

  8. #8
    Crestwood1001 Guest
    Off the top of my head I don't remember, not oem but not the cheap one either, if you could measure it I would really appreciate it!

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  9. #9
    Crestwood1001 Guest
    Gary that Teflon tape idea is great didn't even think of it! I may try that as a temp fix till I have a chance to replace the ring

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  10. #10
    Join Date
    Aug 2011
    Location
    Las Vegas, NV
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    5,701
    It should do the trick. Oh ya the oring sits in a groove just behind the taper on the connection. I took mine out to measure, it's the white ring.

    Name:  ImageUploadedByTapatalk1370107869.823027.jpg
Views: 5179
Size:  97.9 KB

    Here is the oring size.

    "Large"

    45.00mm
    Name:  ImageUploadedByTapatalk1370107887.041323.jpg
Views: 3845
Size:  75.9 KB

    39.00mm
    Name:  ImageUploadedByTapatalk1370107919.870277.jpg
Views: 3504
Size:  78.3 KB

    3.5mm
    Name:  ImageUploadedByTapatalk1370107900.559981.jpg
Views: 3513
Size:  80.5 KB

    "Small"

    21.00mm


    17.00mm


    2.76mm


    Gary
    Last edited by WOLFN8TR; 06-01-2013 at 10:49 AM.
    BAVSOUND Stage 1 - UltraGauge - Valentine One - Orion V4's - ARC-8's
    TTFS Engine/SMG Tune/CSL 255 - SGT Headers/Sect 1/SCZA - Evolve Eventuri
    VIS XTS CF Hood - CF Lip/Console/Diffuser - OE CSL Trunk - BWS 500S 9k/11k

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